The undersigned hereby
certifies, in his capacity as an officer of MeadWestvaco Corporation (the Company), for purposes of 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:



the Quarterly Report of the Company on Form 10-Q for the period ended March 31, 2013 (the Quarterly Report) fully complies with the
requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and



the information contained in the Quarterly Report fairly presents, in all material respects, the financial condition and results of operations of the
Company.